Walling, D. R. (1995). At the threshold of the millenium. Phi Delta Kappa Educational Foundation.
芝加哥风格引文Walling, Donovan R. At the Threshold of the Millenium. Indiana: Phi Delta Kappa Educational Foundation, 1995.
MLA引文Walling, Donovan R. At the Threshold of the Millenium. Phi Delta Kappa Educational Foundation, 1995.
警告：这些引文格式不一定是100％准确.